The purpose of this project is to help teachers of mathematics use the computer to aid the teaching and learning of many mathematical concepts in a meaningful way. To this end, commercially available software packages are described which are versatile, cost effective, and easy to use. A review and several lessons, each including homework exercises, have been written for each package and are presented in ready-to-use form. Chapter 1, "Geometric Supposer: Triangles" (Sunburst), includes five lessons, such as types of triangles, angle sums, midsegments, similar triangles, and perpendiculars from a random point. Chapter 2, "Graphing Equations" (Conduit), consists of four lessons of linear equations including an equation and its graph, functions from a given slope, y-intercept or points, and reviews. Chapter 3, "Discovery Learning in Trigonometry" (Conduit) is a lesson about polar equations. Chapter 4, "Interactive Experiments in Calculus" (Prentice-Hall), contains three lessons about the nature of polynomial functions and techniques of numerical integration. (YP)